Patent EP-1319054-B1 (EP)
Inventor: LI JI
IPC: C09K19/58
Filed: 2001-08-25
Granted: 2005-03-16
Abstract: Liquid crystal mixture comprising one or several compounds of formula (I) wherein R1: is H or a linear or branched alkyl group of 1 to 20 or a linear or branched alkenyl group of 2 to 20 C atoms, wherein in either case optionally one -CH¿2?- group being replaced by cyclohexylen -1,4-diyl, or one or two -CH2- groups optionally being replaced by -O-, if non-adjacent to N, or by -C(=O)-, -Si(CH3)2-; and/or one or more H of the alkyl or alkenyl group optionally being replaced by F or CH3 R?2¿: stands for a) H or F b) a linear or branched alkyl group of 1 to 20 or linear or branched alkenyl group of 2 to 20 C atoms, wherein in either case one or two -CH¿2?- groups optionally being replaced by -O-, -C(=O)O-, -Si(CH3)2-, and/or one or more H of the alkyl or alkenyl group being replaced by F or CH3 c) a radical (a) wherein independently from the respective meanings in (I) R?3, R4, R5, R6¿: are independently from another an alkyl group of 1 to 8 C atoms  M1, M2: represent independently from another a single bond, -OC(=O), -C(=O)O-, -OCH¿2?-, -NH- A: is a) a linear or branched alkan-α,φ-diyl group of 1 to 20 or alkene-α,φ-diyl group of 2 to 20 C atoms, optionally, if non-adjacent to M?1/2¿, one or two non-adjacent -CH¿2?- groups may be replaced by -O- b) the group -C(=Y)- wherein Y is CH-Z with Z being phenylen-1,4-diyl, optionally substituted by one to three halogenatoms, alkyl or alkyloxy groups of 1 to 4 C atoms, with the proviso that M?1 and M2¿ are -C(=O)O- and -OC(=O)-, c) the group -CHY wherein Y is CH¿2?-Z with Z being phenylen-1,4-diyl, optionally substituted by one to three halogenatoms, alkyl or alkyloxy groups of 1 to 4 C atoms, with the proviso that M?1 and M2¿ are -C(=O)O- and -OC(=O)-, d) a group (b) wherein p, q are 0, 1 or 2, the sum of p + q being ≥ 1; M3 is a single bond or -OC(=O)-, -C(=O)O-, -OCH¿2?-, -CH2O-, -C≡C-, -CH2CH2-, -CH2CH2CH2CH2- the radicals (c) and (d) are independently from another phenylen-1,4-diyl, which optionally can be substituted by one, two or three F, or cyclohexan-1,4diyl, which can optionally be substituted by one CN, CH3 or F, or pyrimidin-2,5-diyl, optionally substituted by one F, pyridine-2,5-diyl, which can optionally be substituted by one F, or naphthalene-2,6-diyl, which can optionally be substituted by one, two or three F, or 1,2,3,4-tetrahydronaphthalene-2,6-diyl (the aromatic ring optionally substituted by one, two or three F), or decahydronaphthalene-2,6-diyl, or indane-2,5(6)-diyl, or fluorene-2,-7-diyl, or phenanthrene-2,7-diyl, or 9,10-dihydrophenanthrene-2,7-diyl, or (1,3,4)thiadiazol-2,5-diyl, or (1,3)thiazol-2,5-diyl, or (1,3)thiazol-2,4-diyl, or thiophen-2,4-diyl, or thiophen-2,5-diyl, or (1,3)dioxan-2,5-diyl, or piperidin-1,4-diyl, or piperazin-1,4-diyl X is H, OH, a linear or branched alkyl or alkyloxy group of 1 to 20 C atoms, wherein one or two -CH2- groups can be replaced by -O-, -C(=O)O-, -Si(CH3)2-, optionally one or more H being replaced by F or CH3 m: is 0 or 1 X and M?1-(A)¿m-M2-R2 together can constitute a) a ring of 4 to 16 members, optionally substituted by an alkyl radical of 1 to 15 C atoms b) a combination of two either directly linked or spiro-linked rings of independently from another 4 to 16 members, optionally substituted by an alkyl radical of 1 to 15 C atoms in either of the three variants the rings independently from another being carbocycles or carbocycles comprising B, N, O or S heteroatoms.